UNLOCKING HINT
How to unlock the Dark Agent mode: To unlock this mode you need to successfully complete the game in Perfect Agent mode.

UNLOCKING HINTS: GAME SCORE POINTS
Successfully complete the achievements below to unlock Xbox Live Gamerscore points. There are 1,000 total possible points.
Complete a Co-Op mission under the Dark Agent difficulty setting.
Complete a Solo mission under the Dark Agent difficulty setting.
Get 10 kills using explosives in any multi-player mode.
Capture 10 flags in Capture The Flag mode.
Get 10 headshot kills in any multi-player mode.
Get 10 kills in Killcount mode.
Get 10 kills in Team Killcount mode.
Get 10 Melee kills in any multi-player mode.
Survive 10 minutes in Onlsaught mode.
Infect 10 players in Infection mode.
Survive 10 rounds of Eradication mode.
Get 10 sniper kills in any multi-player mode.
Score 10 points in Territory Gain mode.
Destroy 10K CR of property in Sabotage mode.
Get 100 kills using explosives in any multi-player mode.
Capture 100 flags in Capture The Flag mode.
Get 100 headshot kills in any multi-player mode.
Get 100 kills in Killcount mode.
Get 100 kills in Team Killcount mode.
Get 100 melee kills in any multi-player mode.
Survive for 100 minutes in Onslaught mode.
Infect 100 players in Infection mode.
Survive 100 rounds of Eradication mode.
Get 100 sniper kills in any multi-player mode.
Score 100 points in Territorial Gains mode.
Destroy 100K CR of property in Sabotage mode.
Get 1,000 explosive kills in any multi-player mode.
Get 1,000 headshot kills in any multi-player mode.
Get 1,000 kills in Killcount mode.
Get 1,000 kills in Team Killcount mode.
Get 1,000 melee kills in any multi-player mode.
Infect 1,000 players in Infection mode.
Survive 1,000 rounds of Eradication mode.
Get 1,000 sniper kills in any multi-player mode.
Complete five Co-Op missions under the Dark Agent difficulty setting.
Complete five Solo missions under the Dark Agent difficulty setting.
Complete Co-Op under the Agent difficulty setting.
Complete Co-Op on Secret Agent difficulty setting.
Complete Single Player on Agent difficulty setting.
Complete Single Player under the Dark Agent difficulty setting.
Complete Single Player on Perfect Agent Difficulty.
Complete Single Player on Secret Agent Difficulty.
Complete Co-Op under the Dark Agent difficulty setting.
Complete Co-Op on Perfect Agent Difficulty.
Play 10 Dark-Ops games.
Play 10 Deathmatch games.
Play 100 Dark-Ops games.
Play 100 Deathmatch games.
Play 1,000 Dark-Ops games.
Play 1,000 Deathmatch games.

HINT/PLAYING TIPHow to get easy weapons: Once one player has gotten a weapon that another desires, go to Club: Stakeout on Agent. Drop that player's weapon to a second player. Have any one of those players continue through the level normally. If done correctly, the new player could have the weapons in less than three minutes. The faster way through the level is to run in the club after the first objective is complete unarmed, and rush to the very top to Jack Dark.

WEAPON LOCATIONS
The following is a list by level of all the weapons and where to find them. Note: The first and last level do not count for getting weapons. To get a weapon to keep for later use, keep it in your inventory at the end of the level. This is also useful with the "How to get easy weapons" hint. These are all done under Agent mode. Datacore: Demolition: P9P (Pistol): You start with this gun.Nightclub: Stakeout: Falcon (Pistol): Found from almost any guards, such as the first two.UGL Liberator (SMG): Found from the guard on the third floor. He should have two of them.DEF-12 Shotgun (Close Combat): Find from the enforcer in the beginning (After you scan him of course!).Frag Grenade: Hidden behind a vent in the basement. The stairs leading down are located in the back right corner of the nightclub from the front door. Once you have gone down the stairs there should be two vent coverings. Break them and get the grenade.Subway: Retrieval: DW-P5 (SMG): Found in the only open storage crate after you have gone through the parking garage.CMP-150 (SMG): Found from some guards.Rooftops: Escape: M60 (Heavy): Found once you get to the fire doors. Go past the fire doors and lock pick the door. It should be standing atop an artillery box next to the guard.Jackal (Heavy): Found from the sniper if you did not shoot it off the building. The easiest way is to put away any weapon you have (Up) and use disarm (RB).Mansion: Infiltration: Magsec 4 (Pistol): Found from all guards at the beginning of the level.Viblade (Close Combat): Found once you get in the mansion. It is standing on a pedestal in the middle of the laser maze.Laboratory: Rescue: Magnum (Pistol): Found from the yellow suited guards that come once the alarm is triggered.KSI-74 (Assault): Found from almost all blue guards.River: Extraction: Rocket Launcher (Heavy): Difficult to get and should only be done on co-op. Once you get outside, open the gate and clear the guards. Now on the hovercraft that you take, once on the gunner press Y to switch for another heavy weapon (M60 and Plasma Rifle only).Trinity: Infiltration: Combat Shield (Close Combat): Found from one of the guards after you picked up Dr. Carrol. There are two guards once you find the round walkway the leads to the lower level.Hawk Boomerang (Thrown): Found in one of the boxes in the beginning of the level. This is easier to get after you have picked up the X-Ray goggles in the weapon cases to the left once you start.Trinity: Escape: Psychosis Gun (Pistol): Found from most scientists throughout the level.Jungle: Storm: RCP-90 (SMG): You can find this either from the assaulting guards or atop of boxes by the left wall. Try using this on that level every time you play. Secondary (RB) makes an outline of red around your enemy, at the lost of some accuracy.Temple: Surveillance: Plasma Rifle (Heavy): Found at very end of level from any of the phantoms.Laptop Gun (Assault): Found from one of the two guards after you have gone down two levels. If one of the guards plants one, reprogram and pickup. It should say reprogram once you get close to it.Frag Grenade (Thrown): Found from some of the guards. This may be difficult to find.Multimine (Thrown): Found from the guard that is either on the water bridge, or around the corner after it.Outpost: Rescue: FAC-16 (Assault): Found in one of the weapon cases after you rescue Jonathan.Flash Bang (Thrown): Found from one of the guards in the room before you go through the double keypadded door.Bridge: Assault: Shockwave (Heavy): Found from the fallen Carrington sniper once you go to aide Jonathan's team.Super Dragon (Assault): You may have found this gun before. Found at this level from some of the guards on the bridge.
HIDDEN RAT LOCATIONS
All rats are usually in shadows or in spots where it would be tortured. Datacore: Demolition: Immediately after you finish blowing up the CPU with your Cam-Spy you will go down a hallway, and go to the left where you will enter the room with the scientist. You must free him from the Spider Bots so that he can open the door. As soon as you enter the room, go to the back wall, up against the railing. Follow the railing toward the scientist. You should see a part of the floor made of see through glass. There are two places in the room with the glass floor; make sure your looking into the one nearest to the door. Look down and through the glass. You should see the rat on the right side. Note: Its easy to find because it has bubbles coming off of it. Nightclub: Stakeout: Once you kill the first two guards, go to the main staircase. The rat is just lying at the bottom of the fountain. You can also shoot him.Subway: Retrieval: Location not knownRooftops: Escape: Once you get to the ammo bow with a DW-P5 inside of it opened, the rat is directly behind it in the shadows.Mansion: Infiltration: The rat is found at the left snow mound at end of level near the pond and arena entrance. Its head is buried in the snow.Laboratory: Rescue: The rat is on a testing machine directly next to the silver keycard.River: Extraction: Location not knownTrinity: Infiltration: A sniper rifle is recommended. After you defeat the brothers, turn around and go to the left staircase. Once you are down there, zoom into the water and look for a submarine. Once you find it, look on the top, near the entrance hatch. Look to the left and the rat should be there. A second rat is on the launch pad. It is smoking.Trinity: Escape: Location not known.Jungle: Storm: Location not known.Temple: Surveillance: The rat is impaled into one of the spikes in the first trap.Outpost: Rescue: Location not known.Arena: Showdown: Location not known.

GAME GLITCHES
The see through wall in the Desert map game glitch: At the Desert multi-player map, there is an area where you can take cover and see through the wall. In order to do this, you must have Bases 2 and 4 open. Go into the cave temple base. Once you go through the hall, go up the sand hill, and not the stairs. Go in the little courtyard from either entrance then turn left. There should be a bowl near the wall. Stand as close to the wall and as far in as you can into the wedge created. While standing, go into cover. If done correctly, you should be able to see through the wall. This is most effective during the Infection game type with the Plasma Rifle. Hide there and whenever you see a skeleton, use the secondary function (invisibility). They will usually walk out because it is very difficult to see you. The dummy flag game glitch: In a capture the flag game, have one player get the flag and bring it back to his base to score. Before he scores, have the party leader go to the enemy base and stand on the enemy flag holder (the colored circle under where the flag starts). Stand over it in a position so that he can see the color on every part inside of the circle. Once he is positioned, score the flag and stay there. Every time you score it should say "Enemy flag returned" at the bottom. After that, the flag will come back out as though you dropped it before you made it to the scoring spot. If you stand there, the flag will score very quickly, but you will not be able to tell until the round is over and it shows the scores. If the player on the enemy flag holder dies or moves too far away for any reason, the flag will come back to the enemy base. The Hawk's barrier game glitch: Have a Hawk and one of the two vehicles. Throw the Hawk and get on the vehicle. While driving around, hold the RB and the secondary function of the Hawk will activate. Usually the Hawk's secondary function will protect you from explosions and have a white lined barrier appear around you. However this glitch will only provide the visual effect and will not protect you. This does not work on the gunner position of the hovercraft. The floating game glitch: Get in a hovercraft. get in. Have another player shoot you in the head and kill you. Then, have them jump in and quickly jump out of the hovercraft.. Do not press a button to respawn until they are out of the hovercraft. When you respawn, you will be able to walk on air, including walking above the desert wall. To get down, you have two options. Either walk into a wall and press A, or have someone shoot you in the head and kill you if you are to high to reach a wall. You can keep stair stepping up the mountains to get even higher.